mango/kernel/port.c

#include <kernel/channel.h>
#include <kernel/port.h>
#include <kernel/util.h>

#define PORT_CAST(p) OBJECT_C_CAST(struct port, p_base, &port_type, p)

static struct object_type port_type = {
	.ob_name = "port",
	.ob_size = sizeof(struct port),
	.ob_header_offset = offsetof(struct port, p_base),
};

kern_status_t port_type_init(void)
{
	return object_type_register(&port_type);
}

struct port *port_cast(struct object *obj)
{
	return PORT_CAST(obj);
}

static void wait_for_reply(struct port *port)
{
}

struct port *port_create(void)
{
	struct object *port_object = object_create(&port_type);
	if (!port_object) {
		return NULL;
	}

	struct port *port = PORT_CAST(port_object);

	port->p_status = PORT_OFFLINE;

	return port;
}

kern_status_t port_connect(struct port *port, struct channel *remote)
{
	if (port->p_status != PORT_OFFLINE) {
		return KERN_BAD_STATE;
	}

	port->p_remote = remote;
	port->p_status = PORT_READY;
	return KERN_OK;
}

kern_status_t port_send_msg(
	struct port *port,
	const struct msg *req,
	struct msg *resp)
{
	if (port->p_status != PORT_READY) {
		return KERN_BAD_STATE;
	}

	struct thread *self = current_thread();
	struct kmsg *msg = &self->tr_msg;
	msg->msg_sender_thread = self;
	msg->msg_sender_port = port;
	msg->msg_req = req;
	msg->msg_resp = resp;

	unsigned long flags;
	channel_lock_irqsave(port->p_remote, &flags);
	channel_enqueue_msg(port->p_remote, msg);
	channel_unlock_irqrestore(port->p_remote, flags);

	port->p_status = PORT_SEND_BLOCKED;

	wait_for_reply(port);

	return msg->msg_result;
}